I need help identifying these war items (binoculars and bullet)

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These were given to me from my Grandpa who was a WWII Seabee. The lettering on the binoculars is very difficult to photograph so I figured it would be easier to just type in what it says.

The right side just says "6x30"
The left side says:
"U.S. NAVY, BUSHIPS
MK.XXXIII MOD.O.
**there is a capital "N" inside a circle***
UNIVERSAL
CAMERA CORP.
NEW YORK, U.S.A.
1943"

If anyone can help identify these I would greatly appreciate it. I am not planning on ever getting rid of them but it would be nice to know if they are worth anything and where they came from.

It is my understanding that the bullet is an armor piercing bullet and it almost hit my Grandpa. I would hope it was enemy fire.

 

The bullet appears to be a 50 cal AP round. Guessing based on crude measurements. If you can get exact measurements (micrometer) someone can confirm it for sure.

 

The binos appear pretty standard issue and a appropriate for a WW2 Sea Bee. The bullet looks like .50 cal AP round to me as well.

 

The binos are positively US WWII ones . They are dated 1943 and the name from New York is the Maker . It's a serial 23 and "O" model. . 6 x 30 stands for enlargment . So you can see things 6 times bigger if needed.

 

The 6x30 is six power (magnification) the 30 is the lense diameter in mm. The navy used a lot of 7x50's as the larger the lense (to a point) the greater the light gathering capability in low light. The 7x50 was a good compromise between magnification and light gathering. As you increase the magnification it becomes harder to hold a steady view.

 

vinny is right I meant 6 times not 30 (post edited)

 

Considering the bullet is 2 inches long, or 50 mms, I myself think it is the remains of a 6.5x50mm cartridge adopted for the Arisaka bolt-action rifles used by Japan.

 

The 50mm refers to overall cartridge length not the length of the bullet

 

My stupid mistake